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REV-A: 03/18/93 


I A Journal WVHI-DHP Radio Lfeclinologjr Ssnginpring 

Published by COMMtronfcj Euglnwrlng at PO Bo* 262478; San Diego, CA 92196 
!ill!ll!l!-1 Vopyrlglrt i j>f;l 991*95 <AH Rl^its .Reserved^';-: i /ISSN 1061-9240 ii||B|J!|||l| 

ip Volume 5, Number-1 $5.00 

REFERENCE-PAm killlllll 

WSR Voiee/Bu*ttte$a> l i - i 

' : . Non^Hdayweekdim 

Hertzian intercept BBS, 5i30pm^>30pm*; PiS!T : ; 

: ’ Weekday* & 24^-weekefKfe 
BBS Setup: 1200-28,8tffl~bp$+ 8N1, ANSI or TTY. 

Index & table i?f Contents to WSR always available 
for free download from BBS or ^iyfor : Kf Si)0$ 
floppy disk or $5 printed hard •-x:# :; 

© FIRS l ISSl’E ’95 © I 

Here we go, folks; first issue of : 1995' is 
hot off the press and we've made 
progress already. . Notice the photo on 
the right? Compare the detail to other 
photo's we’ve published H in !; the past; 
Well, true to our promise to ever be on 
the upward spiral, we've added some 
new equipment to upgrade the quality of 
our photographic processes,;; Ypu'llfind a 
steady qualitative improvement in the 
WSR over this coming year. 


The darned Postal Service raised the cost 
of mail by just enough that when coupled 
with ever rising costs of materials and 
processes these past four years, it’s come 
time to raise subscription prices. 
Clearly, we have little or no control over 
these variables, but relax...prices will not 
rise without ample warning and an 
opportunity to cash in on the old rates. I 
don’t know how much prices will rise, 
but the timing will probably be for the 
last half of 1995, so look for new rates to 
go into effect by July, 1995. You’ll be 
advised before then. 


Refer to the photo on this page for some 
ideas on how to better implement some 
of those older modifications. 

PinLine Sockets: For starters, notice the 
PinLine strip just to the left of CN-501? 
It’s a 13-pin strip with male pins 
inserted into and soldered to the 13- 
unused holes that can be found on the 
Logic/CPU Board just to the left of C- 
502. The exposed female sockets can 
accept a mating 13-pin strip of male 
plugs to facilitate easier connection of 
various mods to CN-501. For instance. 
Key Research Co’s SEARCH & STORE 
modules require several connections to 
CN-501. The CE-232/HB-232 Scanner- 

Computer Interface connects to CN-501. 
This month’s REMOTE CONTROL 
modification uses several pins at CN- 
501. There is no sense in connecting 
directly to CN-501, however; not when 
those 13 unused holes beg for something 
much more convenient to be stuck in 
them. Soldering to CN-501 may destroy 
it as can repeated connections and 
disconnections over a period of time. 
Add a 13-pin PinLine strip to these holes 
to make it much easier on yourself and 
your scanner. 

Memory Mods Made Easier: The 
Extended Memory varieties of MOD-16 
are immensely easier and less error 
prone if you use a surface-mount SRAM 
chip in lieu of the much larger DIP style. 
See WSR V1N8 & V3N4 for methods and 
procedures. Most of the pins of the 
replacement SRAM chips fit, pin for pin, 
with the existing pads of the stock 
SRAM chip, so at worst, you need only 
cut a trace or two and run up to six wires 
from the new surface mount SRAM (as 
opposed to 28 or more wires required for 
the DIP type SRAMs. 

Shown in the photo above are the six 
wires of a 25,600-ch Memory Mod going 

into a smear of hot-glue that holds the 
corresponding pulldown resistors and a 
strip of PinLine sockets to mate with a 
plug that goes to the memory Block 
switches. Thus, the area of the SRAM 
chip need have no strain put on it by 
floating wire bundles and operator 

The above example shows the end of the 
metal shield cut away to expose the area 
of the stock SRAM and CN-501. You 
may or may not wish to be so drastic 
with your cutting. If you carefully route 
those six wires away from the new 
SRAM chip, it may not be necessary to 
cut any of the metal shield except for 
about a Va" strip that covers the 13-holes 
in back of CN-501. Even that cut is not 
necessary, if you don’t use CN-501 for 
anything. (/ can 7 imagine that, though .) 

Other Mods on the Logic/CPU Board 
can be simplified by the use of PinLine 
Sockets and judicious cutting of the 
chrome metal shield, as needed. One 
thing you don’t want to do is continually 
disassemble and reassemble that front 
panel and Logic/CPU board every time 
you or I think up a new Mod. 
Fortunately, mods in that area are rare. 

05/18/95 — 00:27 ~ Page 1 

Most other mods actually require one or 
more connections to CN-501, so that 
strip of PinLine Sockets can be a 
godsend if you’ll take the time to do it. 

Some mods may require connection to 
the same pin of CN-501. When that is 
the case, you can use a pair of pinline 
sockets soldered together at their bases 
with one pin plugging into the desired 
pin of CN-501. In that fashion, a single 
pin is brought out to a double socket, 
more or less something like this: 

your own quick-disconnect wire splices! 
The males of one set of PinLine sockets 
are wired to accept the females of an 
identical set as shown below: 

Next, we have a method of building 
entire circuits on a PinLine strip so that 
the strip can then plug into a mating 
strip. Note the two circuits just below: 

Below is a view of the left circuit above 
plugged into a mating strip under CN- 
501. This circuit lias been sealed and 
protected with hot glue for strength and 
insulation. For those not in the know, 
above and below depict diodes Dl-8 and 
resistors, R4-7, of the CE-232 Interface. 

PinLine sockets make great connection 
points for simple circuits seen below. 

Below is a PRO-43 with a polarized strip 
of PinLine sockets (6 x 5) for connecting 

great and wonderful things from the 
outside world. Below, is a cable with 
mating PinLine plugs for the PRO-43. 
The 6x5 arrangement eliminates 
confusion on which way the plug should 
be inserted. The PinLine plug is sealed 
in hot glue and features a “pull loop” of 
stout wire to avoid breaking the fragile 

The large photo at the top of the page is 
a CE-232 Interface board that sports 
liberal use of PinLine sockets with which 
to connect the various Input, Output, and 
control wires. This makes for easy 
installations and easy removal for service 
and related hacking adventures. A few 
quick disconnects, and the unit is ready 
to yank for whatever reason. Smart 
hackers always make it easy on them¬ 
selves, knowing full well that if 
misfortune doesn’t strike, they’ll be back 
in there doing something else soon. 

12/28/94~ i:44 pm~ The "WorldScanner Report” © 1991-95; Volume 5, No 1; Page 2 

Below are suppliers and part numbers for 
PinLine sockets. Keep a supply on hand 
for a variety of uses. 

DieiKev (800) 344-4539. 


Hosfelt ($00) 524-6464....21-161, 21-234 or 21-264 | 

Mouser f800) 346-6873. 

.151-5520, 151-5530 

Hosfelt Electronics’ “ machine pin SIP 
sockets ” are a best buy with the most 
pins for the lowest cost. DigiKey’s and 
Mouser’s are pricier for some reason. 


1 FOR THE PRQ-2004/5/6 1 


You’d think it a simple matter to add a 
remote controller to the keyboard of a 
scanner. After all, a keyboard is just a 
bunch of push-button on-off switches. 
And, heck, all it would take is a batch of 
remote switches wired in parallel with 
the ones on the keyboard via a long cable 
and there’s your controller. Right? 

WRONG! Well, sort of, anyway. To 
control a few of the scanner’s functions 
by a remote wired controller is not 
difficult but it can’t be done the way you 
might first think, because the scanner’s 
keyboard connects directly to the micro¬ 
computer (CPU) and all the keyboard 
switches are located only an inch or two 
from it. When the length of the switch 
lines is more than a few inches, the CPU 
becomes vulnerable to noise, capacitive 
loading and other nasty, disagreeable 
effects. The CPU will lockup and/or 
some functions may not work. So, we 
have to isolate the remote controller, its 
associated switches, and long cable from 
the CPU and Keyboard, and still provide 
the same switching action as the 
Keyboard. No problem! We need one 
chip, and a few parts to remotely control 
up to three functions. 

The neat little 4066 CMOS chip we’re 
using here contains four electronic (not 
mechanical) SPST switches. Take a look 
at the Pinout for the 4066 chip, and 
you’ll get a pretty good idea of how it 
works. Each of the four switches on the 
chip has three pins: IN, OUT (makes no 
difference which is which) and a Control 
pin. This accounts for 12 of the 14 pins. 
Another pin is for GROUND and the last 
one is for +5volt power. A switch is 
open when its respective control pin has 
no voltage applied. When +5v is applied 
to a control pin, its corresponding switch 
segment “closes”. When +5v is removed 

from the control pin, the switch opens 
again. Each switch is isolated from and 
independent of the rest. Pretty simple, 
actually. The 4066 chip isn’t available 
from Radio Shack, but they can order 
one for you. The CD-4066 is available 
from most electronic supply firms. 

the CD-4066 because of lower “contact” 
resistance and higher speed of operation. 
They are a bit harder to find and either 
one will do for the most part. 

Scanner keyboards are arranged in a 
expanded "tic-tac-toe" grid or matrix 
consisting of columns and rows. The 
PRO-2004/5/6 use a 4-row x 8-column 
matrix. The functions to be remotely 
controlled (MANUAL, SCAN and 
DELAY) are arranged in one column 
and three rows. (4 wires total). For the 
necessary isolation of the remote 
controller from the keyboard, the 4066 
chip will buffer the one “column wire” 
and the three “row wires”, a pair each of 
which will be triggered by one of the 
three external control switches on the 
remote control box. See below for a 
pictorial of the PRO-2004/5/6 Keyboard 
Switch Matrix. 

This article and diagrams are designed 
for the PRO-2004, PRO-2005 and PRO- 
2006 scanners, but there’s no reason why 
the exact principles given here can’t be 
applied to other scanners and tilings that 
use a matrix keyboard for control or data 
entry. As depicted here, the principle is 

sound and functional for most anything 
that requires only a few remote control 
switches. If you want total control of 
your scanner, like all 29 Keyboard 
functions, this approach might not be the 
best because of the necessary eight or 
nine 4066 chips and the rather heavy 
umbilical cable with over 30 control 
wires. As it is, the method shown will 
control up to three functions using four 
wires. If you use a shielded 9-conductor 
cable, you can add another three 
functions of choice by duplicating the 
circuit and process shown here for seven 
wires. For the rest of this article, we will 
employ the KISS principle: (Keep It 
Simple, Stupid). 

It is highly recommended that you get 
the Service Manual for your scanner. It 
will help you locate and identify areas in 
which you will be working. For the 
PRO-2004/5/6, the Service Manual can 
be ordered direct at (800) 442-2425 . 

First, build the simple circuit shown in 
the schematic on a small piece of perf 
board and install it as close as possible to 
the Keyboard. 

For the PRO-2004, install the new board 
on the back of the Keyboard PCB inside 
the sloped front panel and solder its 
output wires from Ul, pins 1, 4,. 9, & 11 
directly to Keyboard solder pads #7, 9, 

10 & 11 respectively. (NOTE: a BLACK 
factory wire is at Keyboard solder pad 
#13.) Length of these wires should be a 
couple of inches at the most. 

For the PRO-2005/6, install the new 
board on its side on the main receiver 
board just below the Logic/CPU 
Keyboard Connector. Solder the free end 
of each output wire from Ul, pins 1, 4, 9 
& 11 to the PCB holes for the Keyboard 
Connector (CN-501) at pins #7, 9, 10 & 

11 respectively. Better still, use PinLine 
sockets & plugs as tipped on page 2! 
Looking down onto CN-501 from the 
top. Pin 1 is at the extreme right and Pin 
13 is at the extreme left. 

The power & control lines from the 
board (Ul, Pins 5, 6, 12 & 14) to the 
remote controller should be neatly routed 
around the perimeter of the scanner 
through a %" hole on the rear panel. 
These wires should protrude from the 
rear maybe two or three inches at the 
most and then terminate at the in-line 
socket (J-l) for quick and easy 
disconnects when the remote controller 
is not needed. A mating connector for 

12/28/94 - 1:44 p\t~ The "WorldScanner Report" © 1991-95; Volume 5, No 1; Page 3 


R ?9 Note 1 

+ 5V <1- 
OUT Lug of IC-8 Nf 

in PRO-2004/5/6 

Corrected 05/18/95 from V5N1 



OR 10 

PADS IN PRO-2004 1 1 




“ f 












e 5 I 

k ? 



1. Other scanners: any regulated +5v source 

2. Umbilical cable can be of any practical legth but 
probably not over 25-ft (6 to 8-ft for most needs.) 
Use shielded cable. Solder or bolt the shield both 
to scanner's ground and to the Remote Control 
Box chassis, if metal. 

3. Push button switches are the normally open 
(n.o.) type. 

4. Build circuit on perf board about 1" x W\ 

Install close to the scanner's keyboard. 

5. Circuit board ground can go to any scanner 
ground but should also be directly connected to 
Keyboard Pin 13. 

^Atl {Right* {Reserved 



P 1 

P 1 

P 1 








-o o- 


O O- 


-O O- 

Note 3 





Note 2 

this plug (P-1) should be soldered to one 
end of the desired length of shielded 
umbilical cable, 6-8 ft typical, and maybe 
a maximum 25-ft. The other end of this 
cable should be “hardwired” to the 
remote control box as shown in the 
schematic diagram. 



Radio Shack 


Qty Description 

Cat No 



CD-4066, 74HC4066, 

See text 

or ECG/NTE 4066B 



2.2-uF/35vdc Tant cap 




0. l-uF/50vdc mono cap 




Switch diode,, 1N4148 




Jack, In-line, DIN, 8-pin 




Plug, In-line, DIN, 8-pin 




100-k, 1/4-watt resistor 




Switch, pb, SPST, mo. 


or-1556 or-1571 or-1549 



Shielded Cable, 9-cond 




Metal or plastic box 

See text 



Hookup wire 




Perf Board (cut 1” x 1H") 




Socket, IC, 14-pin DIP 


Neither the box nor the circuit wiring are 
critical, provided that you stick to the 
circuit design. You are free to apply 
some ingenuity and creativity in this 

project. The box should be metal, but 
plastic will do if you can’t find 
something better. Radio Shack doesn’t 
have a really great box for this purpose, 
but several of their offerings can be 
pressed into service. I like the sloping 
metal box from LMB, model MDC-642, 
available at some electronic supply firms. 
The box can hold lots of other things 
besides remote control switches: CTCSS 
Decoder....DTMF Decoder....much more. 

Solder or bolt the shield of the umbilical 
cable to the metal frame just inside 
where it enters the rear of the scanner. If 
you use a metal box, then solder or bolt 
the cable’s shield to a handy spot just 
inside where it enters the box. Be sure to 
solder the cable’s shield to the metal 
shells of both the plug and the jack. 

press S-l to set the MANUAL mode. 
You’ll see how this applies +5v to U-l, 
Pin 5 and to Pin 13 via D-3. A quick 
look at the 4066 Pinout on the previous 
page shows that Pins 5 & 13 are the 
Control Inputs for Switches A & B. 
Therefore, pressing S-l causes Switches 

A & B to close. When this happens, 
whatever is at Lug 7 of the nearby 
Keyboard Connector passes into U-l via 
Pin 1; out on Pin 2 to Pins 3, 8, & 10. 
Pins 8 & 10 are not active ( Switches c&D) 
but Pin 3 is active (Switch B), so the 
signal goes back out Pin 4 to the 
Keyboard Connector at Lug 9. 
Summary: Pressing S-l causes a short 
circuit path from Lug 7 to Lug 9 of the 
Keyboard Connector\ So what does that 
do? Well, take a look at the Switch 
Matrix diagram on the previous page to 
see where Lugs 7 & 9 are the unique 
combination for the MANUAL function. 

Diodes Dl-3 are isolation diodes to 
permit simultaneous, individual control 
of the desired three rows and the one 
column. C-l is a decoupling & filter 
capacitor that should be installed right at 
Pin 14 with a short lead to Pin 7. I 
specified 2.2-pF but it can be as low as 
0.1-pF. Resistors Rl-3 and capacitors 
C2-4 are for noise immunity. The 
resistors can be of any type, but the 
smaller, the better. The capacitors 
should be monolithic types, 0.1-pF. The 
alternative ECG or NTE-4066B are the 
same as the CD-4066. 

P-1 and J-l to be an “in-line” plug and 
socket combination to make the 
installation as easy as possible. If you 
want to get slick and if you have the 
right tools and patience, you can install a 
female DIN jack or even a DB-9 jack on 
the rear chassis of your scanner. 
Fabricate a mating plug for the end of 
your umbilical cable, and you’re in 
business with a pro-quality installation. 

Radio Shack has discontinued my 
favored 278-775 shielded cable, but some 
stores may still have a supply. Good 
stuff, if you can find it. Also #278-776 

The push-button switches can be as 
simple as specified in the Parts List, or 
you can salvage a telephone keypad or 
most any other kind of electronic keypad 
if you want to go ‘high tech’ with this 
project. Switches are switches. 

Use an IC socket for U-l, if you’re smart. 
Makes swapping out bad chips a breeze. 

Technical support for this and all WSR 
projects is available through the 
Hertzian Intercept BBS and the FidoNet 
as well as by US Mail if needed. * ¥ ♦ * 

05/i8/95~oo:32~ The "WorldScanner Report" © 1991-95; Volume 5, No 1; Page 4 Rev*ovum 

I IT'D AM TTPflT ?Dl? K Ani? D Of : I' 

i Jtvv/iVl 1 titii Kili/vU EiKu i: 

Electroluminescent Panel Prohlems 

From: Scott Larsen, Concord, CA : I 
would like to tell you that your WSR is 
excellent. Please renew my subscription. 
Also, I would like to know if you could 
help me with a small problem. I bought 
my 2nd PRO-2006 from Grove about ten 
months ago. I clipped the diodes and did 
the headphone improvement. That’s the 
only mods I did. I turned the unit on one 
day to discover that the display light 
would not work. I disassembled the unit 
and checked what connections I could, 
but I could not solve the problem, all 
other functions work. I plan on getting a 
shop manual soon. Can you help? 

ED: I can 7 help a hell of a lot until you 
have the Service Manual in hand. The 
Electroluminescent Backlight is a 
chemically active panel that slides in 
behind the clear LCD Display module. 
This EL panel frequently “wears” out, 
noted by a gradual dimming, but if yours 
went suddenly, the EL panel is probably 
ok. You may have to replace it as a last 
resort, though. Meanwhile, the EL 
Panel runs from a 60-80 volt AC signal 
produced by T-501, a small transformer 
on the Logic/CPU board. T-501 is 
driven by an oscillator, Q-508, running 
at about 300 Hz. Power to Q-508 is +Jv 
via SW-502, a series resistor and R-511. 
The problem you described will reside 
exclusively in this small area. I have 
noted in some units that T-501 seems to 
magnetize and attract metal filings and 
scraps. IPs possible this happened in 
yours and thereby shorted out two or 
more terminals of the transformer. A 
good cleaning may be in order; 
otherwise, you'll have to troubleshoot 
the aforementioned circuit. 


From: Charlie Warfield, Naperville, IL 

I have Scanner Mod Books I & II, as 
well as several back issues of your 
newsletter. Using these, I have done 
several modifications on my PRO-2006 
and PRO-43. Your publications are 
everything you claim them to be and 
more! Even with the few minor changes 
I’ve made, I feel like I already got my 
money’s worth. THANK YOU!! 

My question is related to speeding up the 
scan rate in the 2006 and 43. On page 

82 of Vol II you state that changing the 
clock crystal is risky and experimental, 
but in V1N1 of your newsletter you state 
with at least some confidence that an 18 
MHz crystal is okay. Since I work for a 
living and cannot afford to “experiment” 
on my $400 scanner, I am asking for a 
clarification on this mod: Is it a tested & 
approved mod, or is it “experimental”? 

I also have the same concern about 
speeding up the PRO-43. The V3N8 
WSR has the procedure, but your 
commentary does not persuade me that 
this mod is worth risking. 

My second question is about crystals. An 
engineer friend of mine says that, for the 
most part, all crystals are the same. Yet, 
if they’re all the same, why does Digi- 
Key have pages and pages of them? 
Could you please help by explaining in 
more detail the type and style of crystal 
needed? Digi-Key has crystals described 
as being for “general purpose” 
applications. Will one of these work, or 
do you have a better recommendation? 

ED: I do not support crystal speed-ups 
anymore except in rare instances where 
a need overrides the side effects. First, 
you should be aware of the serial aspect 
of my books and the WSR: The books 
were written in ‘89 and ‘90 and the WSR 
was started in ‘91. Latest information 
always supersedes older data There 
was a time when 18 MHz crystals worked 
for me in the PRO-2006, but later, two 
CPU's blew out at 18 MHz, so the 
maximum safe frequency is now 16 MHz 
for a modest 33% increase. There are 
other side effects that I don 7 like, such 
as shortened DELAY; squeaky BEEPs; 
and incompatibility with other important 
mods. At least two major mods that I 
know of will not work with crystal- 
speeded up PRO-2004/5/6's. So, the 
risk, coupled with reduced performance 
and shrunken playing fields for other 
mods has disillusioned me with speed 
boosting. I don't support it anymore, 
though I may tell how to do such mods 
from time to time. That doesn't mean 
you have to do them, though. 

By the way, crystals are NOT all the 
same. They differ as night and day! For 
speedups, the proper type is known as a 
“microprocessor crystal” which works 
at the fundamental frequency. Other 
types are dangerous and risky. Key 
Research Co. was alive and well last I 
knew, but no news of recent times. 

From: John Kline, Slidell, LA: 

Translated: Please Prof 
Peabody , tell us about 
those unpublished 
CTCSS mods?!! We 
all love you! 

Speaking of CTCSS, 
I think a good mod 
would be to interface 
the PRO-43 and 
other handhelds to Optoelectronics DC- 
440. This unit is small and has battery 
option so that puts it in the “cany along 
mode”, doesn’t it? Merry Christmas 


From; D. Michaels. W. Seneca, NY 

I would like to take this opportunity to 
inform you of an interesting situation 
regarding my Radio Shack PRO-34 that I 
purchased in early ‘90. I am basically 
satisfied with this scanner but I always 
felt that the sensitivity on the VHF Lo, 
VHF-Hi & Aero bands left something to 
be desired (even on an outside antenna). 
I just chalked it up to “the nature of the 
beast” as I have read many complaints in 
various magazines regarding poor 
sensitivity of the PRO-2004/5/6. 

Approximately one year after purchase 
my unmod’d PRO-34 developed serious 
problems. The Radio Shack store told 
me the scanner would have to be sent to 
a repair center. As the repair order was 
written up, I made sure that the salesman 
noted that I wanted the sensitivity 
checked against factory specs - aligning 
or replacing parts if necessary. Ten days, 
a new PLL chip, and $54 later, my 
scanner was reportedly “as good as new.” 
The repair tag stated that the scanner 
was realigned and that the sensitivity 
was within specs. After trying it, I still 
felt that the sensitivity was poor. 

Recently a friend gave me his PRO-37 
and asked me to fix an intermittent 
earphone jack. After repairing the 
scanner, I had a chance to use it for a 
few days. I was very surprised at the 
signals this scanner pulled in. I dug out 
the service manuals for the PRO-34 & 37 
and found that the sensitivity specs were 
“identical.” I compared the PRO-34 & 
37 Linear Section schematic diagrams 
and found them to be similar. Starting at 
the BNC antenna connector, I looked for 
reasons that would cause a reduction in 
the RF signal. I thought that if C101, 
C125, D115 or DA101 were defective 



12/28/94 — 1:44 pm ~ The "WorldScanner Report" © 1991-95; Volume 5, No 1; Page 5 

then the sensitivity would suffer. On a 
whim I put a small jumper wire from the 
center pin of the BNC connector (before 
C101) and the junction of C126 & L102, 
effectively bypassing C101, Cl 26, 
DA101 & D115 (see included 

schematics). I was pleasantly surprised 
to pick up all sorts of distant VHF 
frequencies. I was hesitant to make this 
“mod” permanent as I was unsure of the 
purpose of the parts that I was bypassing. 

Then another friend asked me to make 
the cellular modification for his PRO-34. 
I was unsoldering the small wire from 
the center pin of the BNC connector 
when I was surprised to find a small 
jumper wire from the center pin to L102. 
I knew that my friend was not the type to 
rip scanners apart and probe around with 
soldering irons. I asked him about the 
repair history of his PRO-34. He 
informed me that from the beginning the 
scanner suffered from poor sensitivity. 
One day, while the scanner was still 
under warranty, he turned on the PRO- 
34 and smoke came out of it. He took 
the scanner back to Radio Shack for 
repair and mentioned the poor sensitivity 
problem. He was pleased when he got 
the repaired scanner back as he thought 
that the sensitivity had improved 100%. 
I assume that the small jumper wire was 
some sort of a factory “quick fix ” 

ED: I do, too , but it is probably an 
unauthorized fix, performed by a RS 
Repair Center technician who didn't 
want to see the scanner come back. 
While I can see that this “mod” may 
work , I am disturbed that it bypasses 
band switching diodes and possibly 
permits both UHF tuners and the VHF 
tuner to operate simultaneously. 
Caution is advised until we can learn 
more about this technique. 

BC-2500 MODS 

From: Udo Schlegel, Rockford. IL 

Dear Bill, Being a current subscriber, I 
was wondering if you or any one of your 
other subscribers could come up with a 
solution for a couple of mods in regards 
to the recent Bearcat 2500 portable 
scanner. I would like to incorporate a 
user switchable backlight for display. 
Currently it automatically turns itself off 
after 15 secs. 

ED: I ’m sure an extended backlight is 
possible, but I have neither a BC-2500 
nor a service manual for it. We featured 
a similar mod for the BC-200 in V3N4. 
You could check it out; compare 
schematic diagrams; and adapt that one, 

Also, is it feasible to incorporate a mode 
switch to select either AM or FM 
regardless of the frequency range as is 
present on several Radio Shack models 
like the PRO-43? 

ED: Vm sure it’s possible, but same 
handicaps mentioned above apply here. 
A careful study of the AM & FM circuits 
in the BC-2500 would disclose the switch 
mechanism that's controlled by the CPU. 
Isolating it and using a toggle switch 
might do the trick. 

Perhaps the keylock switch could be 
utilized for one of these functions. 

ED: Perhaps. . 

What is the difference in your mod in 
V3N10 and the one in Monitoring 
Times? Yours shows the resistor in the 
top row being moved, and the MT mod 
shows it being moved in the bottom row. 

ED: That was my error, subsequently 
corrected and clarified in V4N5. Sorry. 

The BC-2500 has not received wide 
acceptance from the hobby community 
and many regard it as an inferior 
receiver, despite its bells and whistles, 
all of which are “firmware ” based. 
We ve discussed this in back issues with 
the conclusion that firmware features are 
cheap, almost to the point of being free, 
and cannot contribute to the quality of a 
receiver like hardware can. Without a 
BC-2500 and its service manual in hand, 
there’s little I can do to be of help, but 
perhaps others out there have cut some 
turf on that rig. I'll print any worthwhile 
responses to that effect. Generally 
speaking, I have to restrict my time to 
the better quality receivers. 


From: Scott Thorkelson. Canada: I 
was asked to restore cellular capabilities 
in a PRO-2032 scanner. I found the 
procedure described in WSR V4N6, but 
the article referred to a diagram which 
was not shown. (£2): Our mistake, and 
subsequently printed in V4N7). I got a 
copy of Monitoring Times (June 94), and 
found the article and diagram. The 
diagram was poorly done and somewhat 
confusing (I have enclosed a copy), but I 
managed to figure it out and perform the 

I would like to offer my own diagram 
and a simpler method for this mod. 

1. Unplug scanner from power. 

2. Remove bottom half of scanner case. 

3. Desolder and remove shield plate 
located behind Volume and Squelch 

4. Refer to my diagram {next page). 
Locate the dual diode between IC-6 
& IC-5. Cut the trace that runs from 
the upper right leg of this dual 

5. Replace and solder shield plate. 

6. Replace bottom scanner case. 

ED: I’m reprinting your diagram and 
method largely because it differs from 
the one of which I’m aware. You call for 
just one leg of the diode to be cut where 

12/28/94-1:44 pm ~ The " World Scanner Report" © 1991-95; Volume 5, No 1; Page 6 


“Monitoring Times*’ and the WSR, V4N6 
& V4N7 call for removal of the dual 
diode. Obviously, your method works, so 
what is the difference, I wonder? 

From: Robert Lopez, Hesperia, CA 

Dear Bill: I hope you’re doing fine. I 
know you’re busy, but I need your views 
on the AR3000A receiver. What you 
like and don’t like about it, you know 
things like that. Also, I know you like 
the PRO-2006 which I also own, but I 
need a more compact wide receiver 
radio, 500 KHz - 1.3 plus, AM/FM - 
WFM at least. 

I drive a big truck for a living, you know, 
an 18-wheeler for Yellow Freight 
System. I run to the LA basin twice a 
day, six days a week. My radio system is 
set up in an aluminum square cube box 
basically. Ham radios, scanner, amp, 
speakers for noise problems. Thank you 
for your time. 

PS. Best mods? Sensitivity? Options? 
Would make a good mobile scanner? 

ED: The AR-3000 is one of the better 
scanners around, possibly “better ” than 
the PRO-2004/5/6 series. I don't own 
one because the US distributor failed to 
communicate with me on numerous 
occasions when I requested technical 
information on it. Furthermore, the 
service manual is a basic piece of 
manure, not at all typical of that for a 
world class instrument. The AR-3000 
has failed to attract the attention of the 
engineering and serious hobby 
communities, so I don't mess with it. 

My hands are full anyway, just 
supporting the better Realistic ™ 
scanners and in keeping up with the 
latest news around the grapevine. In 
cases like this, I have to depend on input 
from others, and no one is coughing up 
goodies for the AR-3000. I don’t know 
why not, other than it is a 1 minority ' 
scanner that attracts little or no interest. 
I'd be glad to print information on it, if 
there were any available . 


From: Kelly Winz. Ragan. NE: How 
can I put a keyboard lock on my scanner? 
I have a Radio Shack PRO-2030. My 
channel banks keep accidentally getting 
locked in or out or individual channels 
get locked out. 

ED: How in the world does that 

happen? Anyway, there is no practical 
way to lockout the entire keyboard of the 
PRO-2030, but you can disable the 
LockOut key line, if that is causing the 
trouble. The LockOut path consists of 
the traces between Pins 23 & 28 of the 
CPU, including R-225 & R-229. 

Interrupting anything, anywhere on this 
path with a SPST switch will disable the 
L/O function as well as a few other keys. 
Study the schematic diagram to see 
which, and to determine where to place 
the SPST switch, or pick a spot per 
above. By the way, the PRO-2030 is of 
Uniden origin, so we’re not looking at 
one of the more versatile scanners here. 
Still, it appears to be a decent scanner, 
so try my suggestion above and let me 
know if and how it works. 

Dear Cindy & Bill: I want to renew my 
subscription and thank you both for your 
help. I’ve enclosed a $20 bill simply as 
my way of expressing gratitude and relief 
that my scanner mods actually work ! 
My year-old PRO-2006 now has 25,600 
channels, and better yet has 640 Search 
banks. Once I saw this actually work I 
took the plunge and ordered the CE-232. 
I didn’t own a computer at the time, but 
after reading how you did the R&D on 
an XT, I picked one up for $100. It ran 
like a dream until the old monochrome 
monitor gave up the ghost My scanner 
sat idle while I searched in vain for a 
new one. Then a buddy of mine solved 
the problem. He installed a color VGA 
card in the XT, and I simply unplugged 
the SVGA monitor on my two-week old 
486 multimedia computer and plugged it 
in the XT. I only need the monitor for 
about 15 minutes a day to check 
AutoLogged frequencies anyway. 
Besides, who can afford to tie up their 
computer time, controlling the scanner 
when everybody (me & 3 kids) wants to 
play with it? The moral of the story is; 
don’t get rid of those old PC’s. Put a 
$20 VGA card in it and let it run your 
scanner. This bit of wisdom has 
certainly prevented countless potential 
domestic disputes for me. 

Also Bill, I couldn’t agree with your 
politics more. But I think you missed a 
basic element of freedom, namely 
FINANCES. And the assault is on all 
our freedoms as never before. GATT 
passed last night. We have a blatantly 
oppressive and socialist tax structure, 
which props up a treasonous federal 
reserve system. Everyone I know works 
harder and longer for less and less 
spending power. Soon none of us will be 
able to afford transportation, self-defense 
or communications. It will all be under 
government control, or illegal. Keep up 
the good work and I’ll stay in touch! 

Please don’t print my name. I don’t care 
to wake up to BATF shock troops at my 
front door or IRS auditors at my office. 


ED: Right on! You're safe with us. 
Thanks a million for the extra $20. I 
don't encourage that sort of thing for 
\political' reasons, but your gift is 
graciously accepted. Matter of fact, it 
played a role in our decision to buy a 

12/28/94~ i:44 pm~ The "WorldScanner Report" © 1991-95; Volume 5, No 1; Page 7 

flatbed scanner for our computing 
facilities, results of which are plainly 
evident in this issue of the IVSR. You 
kind of helped us set a precedent in the 
sense that any future gratuities and gifts 
absolutely will not be used for personal 
gain; rather we will invest it in some¬ 
thing for the betterment of the IVSR’s 
facilities and resources and thereby give 
the donors a return on their investments. 
Not that any such are solicited, for we 
expect to work for our gain, and any 
windfalls will be allocated to a wise 
investment for the good of all. Thank 
you for your gift and especially for 
helping us to establish this precedent. 

Politics-wise, you're right that I’ve not 
said much about the attacks on our 
purchasing power. I don’t know enough 
to peg that danger. What I do know, is 
that all my adult life, society seems to 
ha\>e felt that government, business, 
labor and our fellow man have had their 
sights set on our wallets. Nothing much 
differs in that respect today from over 30 
years ago when I started paying 
attention to the value of my time and my 
money. Yet, I am considerably better off 
today than 30-years ago. These attacks, 
if that is what they are, have been rather 
impotent in my case anyway. That is not 
intended to convey any relief because I 
am a lot different from my fellow man. I 
refuse to live in fear and intimidation 
and I do not follow all the rules 
commonly respected by the herd. I work 
from sun-up to long after sundown for 
barely more than a pot to pee in. My TV 
set is 12-yrs old; my stereo system is 
over 20-yrs old; my vehicles are over 20 
yrs old; and I carry no more insurance 
than the minimum required by law. 

On the other hand, my kids are getting 
educated to the max; my tools of the 
trade are state of the art and growing all 
the time; and Cindy and I are happy. 

Speaking of tools . I’m wondering why 

you ’re not running your CE-232 on that 
new 486 computer of yours? You do 
know, don’t you, that the CE-232 runs 
under Windows very well? And Windows 
is a multitasker, eminently capable of 
running several applications at the same 
time! You can run the CE-232 in a 
background window or minimized all the 
while the kids are playing games or 
Mama is whacking out a recipe! You are 
not limited or restricted to needing a 
dedicated computer for the CE-232! 

Now there is another thing you might 

consider . later, if not now . and that 

is a LAN (Local Area Network) for your 
computing facilities! You could network 
that XT with the new 486 and any other 
computers around the house, and not 
need a monitor for the XT at all! 

LAN’s are scary to novice computists, 
but believe me, they’re getting cheap 
and almost transparent in operation. 
The power of a LAN is absolutely 
formidable, and yet rather easy and low 
cost to implement. I’m not going to get 
much deeper into networking here, but I 
will propose that with Windows For 
WorkGroups 3.11, the total added cost 
of a 2-node LAN need not be much over 
$200, from start to finish! WfWG 3.11 is 
a self-contained networking package 
(with an advanced version of Windows) 
that needs only a network interface card 
per computer and some RG-58 coax. 
The Add-On version of WfWG 3.11 is 
$49 and LAN adapter cards need not 
cost more than about $49 each....$100 
per node will get a nice LAN up & 

I mention this solely because a LAN can 
be an indispensable tool for the 
compleat radioist! Ummmm, take me, 
fer instance. My personal workstation 
consists of five computers, more or less 
in a circle around me, each one 
connected to the LAN, and then there 
are three more computers elsewhere also 
on the LAN and readily at my access, 
and with rare exception, I need not leave 
my one personal keyboard and monitor 
to have the power of eight machines 
working for me, each capable of doing 
several things at the same time. Ponder 
that concept, as you grow in your 
radioing and computing. © 


From: Tony Thornton. Mize. MS I 
write this note with sadness in my heart. 
I just purchased a new PRO-43 and tore 
it down to do the diode and audio mods. 
To my dismay there is no D-4 diode in 
my pro-43, just empty space. I added a 
1N4148 to restore 54-88 MHz to D3 spot 
but I suppose cellular is a dead issue. I 
am waiting on a service manual I 
ordered a week ago. Just thought I 
would let you know about it if you don’t 
already, so you could let the word out in 
V5N1. By the way, the serial # is 
A002396. The CPU has this stamped on 
it: GRE9326 250 9403 MD014. It was 

purchased on Dec 3rd. The audio mod is 
a great sound enhancer for me because 
I’m a little hard of hearing. Keep up the 
good work & happy holidays. 

£D: The law now forbids scanners that 
can be “easily modified” for cellular 
reception. This has been the case since 
April of this year. No wonder you ran 
into a dead end. PRO-43's with an “A ” 
in the serial number meet this 
requirement. I understand Marymac 
Industries still (as of12/28/94) has some 
modifiable PRO-43’s (and 2006’s) but 
they ’re going fast. (800) 231-3680. 


From: Thomas Nichols, Indianapolis, IN 

Would the BFO project (Pg 98, Jan’94 
MT) fit inside the PRO-2006? How 
much the cost? How about a dual 
control on/off volume control/squelch 
control. Mount it in one hole and put 
BFO control in squelch slot. The control 
is an idea from some CB radios I’ve 
seen. Think it would work? Looking 
forward to Book 3. When the hell is it 
due out? 

What is the cost of adding a LED center 
tuning indication cost? No red LED’s 
please. How about med or light blue? 
Regarding the EMB chip, if I am reading 
the right one, how much would it 
increase the memories with just two 
switches or no switches if it replaces the 
old chip and how much the cost? What 
happened to Key Research? Have you 
come up with anything on the new PRO- 
2035 with 1,000 mems? 

ED: The above circuit, to which you 
referred is a classic type of BFO that’s 
virtually worthless for scanners. USB 
and LSB tuning are accomplished by 
trimmer capacitors Cl & C2; maybe 
great for hams and SWL’s, but a pain in 
the arse for scannists. This type of BFO 
is not very stable, drifting wildly with 
excursions of temperature and supply 
voltages. Scanners require precision 

12/28/94-1:44 PM- The "WorldScanner Report" © 1991-95; Volume 5, No 1; Page 8 

frequencies for SSB , and precision 
adjustments to clarify a signal. This 
circuit would not do for the kind of SSB 
that would be found on VHF and UHF. 

Yours is a great idea for a dual 
potentiometer & On/Off switch on one 
control to free up space for a “clarifier” 
or BFO in the Squelch spot. Cobra and 
other CB radios have long used dual 
concentric controls. So, let's see, the 
PRO-2004/5/6 scanners use a 50-kC2 pot 
for volume and a 10-kQpot for Squelch. 
That combo might be rare. It does not 
appear in Cobra CB rigs that I 
researched. If you come up with 
anything, let me know. 

I cannot quote costs of mods for you as I 
no longer perform them for others; at 
least not at the present, nor in the 
foreseeable future. You can rest assured 
that blue LEDs in an S-Meter are costly, 
and will be rather boring unless mixed 
with green, yellow and red LED’s. 

An Extended Memory mod without 
switches yields no extra memory. One 
switch yields two 400-ch Blocks; two 
switches produces four 400-ch Blocks; 
three switches, eight 400-ch Blocks; four 
switches for sixteen 400-ch Blocks, etc. 
There is no sense in an Extended 
Memory Mod without address switching. 
You can use a single BCD (hex) rotary 
switch to control up to sixteen Blocks of 
400-ch ea. 32-pos BCD switches are 

My third scanner modification book, The 
Ultimate Scanner , is long overdue as it 
is, but might hit the streets by Spring. 


Miamisburg, Ohio (Nov 9, 1994) —The R. L. 
Drake Company is expanding the market 
for the SW8, a portable World Band 
Shortwave receiver, by advertising in the 
December 1 issue of American Way , the 
official magazine of American Airlines. 
Traditionally focusing on the shortwave 
hobbyist through information and 
advertising in radio publications, Drake 
now wants to reach a new population of 
world band shortwave receiver 
consumers. “Drake hopes American 
Way magazine is a way of reaching 
those people who have an interest in 
international news and entertainment and 
therefore might be in the market for a 
shortwave receiver, the SW8 is ideal 
because it is capable of receiving radio 
broadcast transmissions from all over the 
world, hence the name world band radio,” 
says Marketing director, Bob Jackson. 

Based on marketing research findings, 
Drake has decided to expand beyond 
traditional media channels for 
information and advertising. the 
company needed a media outlet to 
advertise to a different, more general 
audience of people who were not 
shortwave hobbyists. Exploring alternate 
mediums for advertising resulted in a 
four-color, half page ad for Drake’s SW8 
in the December 1 issue of American 
Way magazine. 

“Advertising the SW8 in American Way 
magazine is targeted to people with an 
interest in, or a need for, an international 
perspective on news or to people who 

simply enjoy entertainment broadcasts 
from other countries," Mr. Jackson says. 

Drake was searching for an efficient 
means to target the general population, 
while filtering out those people that might 
have an interest in shortwave receivers. 
Through demographic and psycho¬ 
graphic research Drake found that airline 
travelers, more specifically business 
travelers, have interests that are similar 
to those of avid shortwave radio 
listeners. Drake realized that people with 
these interests could lend themselves to 
becoming potential shortwave customers. 

Drake also hopes that the ad in American 
Way will accomplish yet another goal — 
to generate additional business for their 
dealers. Currently, a significant amount 
of Drake shortwave equipment is sold 
direct from the manufacturer by calling 1- 
800-568-3795. “While Drake’s method of 
selling direct has been successful thus 
far, the company would like to see 
customers utilizing the authorized dealers 
more in the future. The dealer can 
interact with the customer on a more 
personal basis and show aspects of the 
equipment that can’t be demonstrated 
over the phone.” Mr. Jackson says. 

The R. L. Drake Company has been a 
leader in the communications field since 
1943, and manufactures a diverse line of 
products including consumer satellite 
television equipment, commercial 
satellite communications equipment, and 
radio communications equipment. 

For additional information contact the 
R. L. Drake Company, PO Box 3006, 
Miamisburg, OH 45343. (513) 866- 
2421, or FAX (513) 866-0806. 

For additional information editors can 
contact: Georgia Morgan. 

12/28/94 ~ 7:22pm~ The "WorldScanner Report" © 1991-95; Volume 5, No 1; Page 9 



Hj ■ 

[USA RATES shown: Canada add 15%; Other Foreign +25%-surf/+50%-Air 



1991 (1st Year, Jan-Nov/Dec)-10 ea $20.00 



1992 (2nd Year, Jan-Nov/Dec)-10 ea $21.00 


1993 (3rd Year, Jan-Nov/Dec)-10 ea $23.00 





1994 (4th Year, Jan-Nov/Dec)-10 ea $25.00 


Work Ph: ( 

) . 


Career or 

1991-94 (All the above) - 40 ea $79.00 



) _ 




Half Year 5ea $15.00 


& Other Radios » 

One Year lOea $25.00 





Visa MstCard COD (+ $8.50) 

Amount Enclosed 1 

Two Years 20 ea $45.00 





□ □ 




Credit Card 

Amount Charged [ 

Scanner Mod Hndbk, Vol-1: $17.95 + $4.00 S&H * 


Acct No: » 




Scanner Mod Hndbk, Vol-2: $17.95 + $4.00 S&H * 


Name of 



Scanners & Secret Frequencies $19.95 + $4 S&H * 


Issuing Bank 



* Canada US$0 S&H; Other Foreign US$9 S&H; ail add extra for Air 


1 Signature Required (for credit card purchases) 


CE-232 Interface Kit $194.95 + $5 S&H; All Foreign add 25%-surf 



Hertzian Intercept BBS Subs: S8/mo $15/3-mo $25/6-mo $40/yr $75/2-yr 





What else to tell us? 


TO; C 








■ wpmmmtMMmmm 

£ fill RECHARGERrllllll 

By Mike W. Flenz - ANR Enterprises 
Neenah, Wisconsin 

Enclosed are the photos I said I would send 
to you about 3 months ago of the battery 
pack charger for the PRO-34/37/39/ 43 
battery packs. Better late than never, huh? 

This little holder allows me to pop in a spare 
pack and charge it up without tying up a 
radio. 1 have two PRO-43's and four battery 
packs, so I'm never without a fresh pack. The 
holder is made from a Radio Shack 4X2 1/8 
X 1 5/8" project box (#270-231) that is just 
the right size for a battery holder tray to drop 
down into. The two springs that contact the 
pack terminals are out of an old battery tray 
from a junked cheapie radio. They are 
mounted into a piece of plastic cut from 
another old box but unplated circuit board 
material would work here, too. The springs 
are mounted with 6/32 bolts at the same 
spacing as the contacts on the packs. That 
piece is then epoxied (R.S. #64-2313) into 
the box at such a position to allow tipping the 
battery tray (contact end first) down into the 
box resulting in some spring tension against 
the contacts. (About 2 1/2" from the inside 
edge of the interior round posts that the 
cover screws go into.) I put a small piece of 
wood behind the springs to relieve the 
pressure on the epoxy. 

The female coaxial jack (R.S. #274-1577) is 
epoxied into a hole in the side and accepts 
the center-negative plug of the R.S. power 
supply that is used with the PRO-34/37. One 
could use any size jack here that fits their 
power supply. This one has a 22 ohm 


for and still haven't had 
time to build.) oh, and I 
also stuck a fuse down in 
there under the jack just 
for that extra safety 

I didn't use the aluminum 
cover that comes with the 
box, but 1 did cut a piece 
of black plastic that covers 
the wiring end of the box 
and installed it with two 
of the cover screws, 
leaving the big end open 
to tip the battery tray in 
and out 

12/28/94- 2.12 PM- The " World Scanner Report" © 1991-95; Volume 5, No 1; PagelO 

resistor in series with the + terminal to mimic 
the charge rate/time of the PRO-34/37/43 
scanners. This also could be changed to suit 
a person's need or eliminated altogether and 
the box plugged into your super-duper ni-cad 
"Safe Charger". (The one I have all the parts 

Hope you can use this 
idea, Bill. Certainly not of 
the caliber of the CE-232 
or 25,600 channel mod, 
but one of those little 
things that makes life 
more pleasant 

ED: Oh, Mike , the 

“caliber” of things is 
not measured by their 
glitz and glitter. There 
are many ways to 
measure caliber, but 
none prove up until 
tested by fire. Your 
project might well save 
lives and property someday. Now there 
is a measure of “caliber” for you! I 
think you did quite well on this one. Got 
any more ideas up your sleeve? 

I • jJj? . •• • # . x* jr a ; ,v • ^ 


: r$m 

:• vr. . '•••::* . : : *f~ 

POeXo Cp Ml&i 


PO BOX 262478 
SAN DIEGO, CA 92196-2478 

941224V5N01 PI 0 HAPPY NEW YEAR 


+ First Issue of 1995 - Subscription Rate Increase Coming Soon! 

+ PRO-2005/6 Hacker Tips ~ Remote Controller for PRO-2004/5/6 & Others! 

+ 4066 Pinout ~ Scanner Keyboards ~ Electroluminescent Panel Problems 
+ Crystals & Scanner SpeedUps ~ PRO-34/37 Sensitivity Mod ?? 

+ BC-2500 Mod Possibilities ~ Another PRO-2032 Cellular Modification 
+ AR-3000 & Lack of Technical Info ~ A Reader Raps ~ Politics-Radio-Computers 
+ PRO-2030 LockOut Key Disable ~ Non-cellular PRO-43 ~ SSB For Scanners? 

+ Press Release: Drake SW8 WorldBand Receiver ~ A Plea to Professor Peabody 
+ Spare Battery Pack Recharger